Pneumatic motor.



J. JOHNSON.

A PNEUMATIG MOTOR. A'PPLIGATION FILED P31117, 1911.

Patented spn. 3

/ orney 'O VICTOR J'. iJ'OI-I "Torill whom/tmog/concern: itjkjno-wnfthatl, Vieron J. JOHNSON, citizeiivofhth'e United' States, residing at AQICSster,`in. the .county of lVorcester and 5, Commonwealth vof .Massachusetts, have `in ,"vent'ed ,a f'ne'w andi useful Improvement in Tneuinatic Motors, of.'v which the following Vis a.specification,` accompaniedv by drawings forming apart of the saine.

My invention relates to that class of pneumatic motors which are employed to move a periforated music sheet over the tracker bar of a piano player, and it comprises a plurality ofA mot-r bellows, each provided with a controlling valve mechanism 'operatively connected with a single crank shaft.

My invention has for its object to render a motor of this class more eiiicient in operaltion, to simplify its construction, and espel cially to render each individual unit sepal rable. This object l accomplish by the construction and arrangement of parts as hereinafter setforth and pointed out in the anneXed claims.

Figure 1 is a perspective view of a motor embodying my present invention. and con# sisting of an assemblage, in the present' instance, of live separable units. Figzf 2 is a longitudinal section through one of the units. Fig is a transverse section thro-ugh two of the connected units on the plane of the broken line 3-3, Fig. 2. Figli is a perspective view of one of the valve guides.

i lar parts in the different figures.

My improved pneumatic mot-orco-mprises a series of motor bellows 1', in the present.

instance 5 in number, leach operativelyconnected by a link 2, with a common crank shaft 3. Upon the stationary leal"4 4 of each 'motor bellows I mount a separatechannel board 5 having a transverse air ychannel, provided at the center of the channel board with an opening 7 communicating with a' recess 8 in the under .side of'a sliding valve 9, sliding'up'on and in contact with the valve face 10 of the channel board 5.- The channel board 5 is also provided with an air Valve IQdS '12 with the links 2,-whereby'a sliding movement is imparted to the valves rivnuivra'rrc Moron.;

l i .Y a Referring to the accompanying drawings.,'

rSimilar reference characters refer to simi- 1 passage 11 leading to the motor'bellows .1. The sliding valves 9 are connected by the` 9. move downward the air passages 7 and 11l of each channel 'board communicate-v with .iaaifnivr onrioii.- g

iisoiv, or wononsfrnn, irassaoiausn'rrs.

'Specicatonlof Letters Ratei-1t; x-v Patented Se1)t.=3,l191=2. alpucatibyi flied rebraary 17,1911. seria; Nd:603,213'5.v Y

the recess Sfthereby establishing a comniu'nication between the interior of ,the motor. bellows l and the transversel air cl `nnel 6, as shown in Fig. In this` position yof lthe. valveA the yair tension or pressure in the motor-bellows will correspond with that kin the air channels 6. As the valves 9 are motor is provided with apipe 1l leading .to la bellows or other means by which air mayv be exhausted `from the air channels 6.

Mounted upon the Vchannel boards are metal guides 15,one of which is shown deguides are each formed from a single piece of steel -wire bent at right angles at each end at 16 to form an odset portion 17, and again bent at right. angles at 1S to form a, leg 19 which is inserted in the channel board. The straight sections Q() are inclosed in longitudinal grooves in .the sides ,of the 'valves' 9 and the offset sections 17' a'llotw..l the valves to beremoved from the ways by disconnecting them from the valve rods '12.

the stationary leaf of its motor bellows by screws 2l. in operative relation to each other by means of met-a'lbarsQQ and 23 yext-ending across and attached to the` ends of the channel boards 5. For convenience ofA supporting the motor in 'position the lower metal .bar ,23 may be extended forming overhanging ends 24 which maybe attached tov-the rigid framework of the instrument.

A The guide ways, orstraight sections 2O tudinal'sides. ofthe valve which are'preferably packed with small Vpieces offelt v26. vThe grooves 25 allow suflieient width of surface on the outer side of the valve to allow a flexible cover '27 to be glued' thereto. 'I claim, A

1. In a. pneumatic motor, a bellows. a block having-an air channel communicating with said bellows and provided with a valve j seat, a slidl'able valve on said valve seat hav- The channel board 'at one end of they tached in perspective view in' Fig. l. These Each ot' the channel boards is attached' to v, The several units are connected moved upwardly the air passage ll'is un engage the grooves 25 in the opposite longiing longitudinal grooves in its sides, and a pair of metal guide ways for said valve con- Vsistin of a air of wires envavinfr said b b b grooves and bent at their ends to form offset legs held in said 4Valve seat.

2. In a pneumatic motor, an assemblage of separable units, each comprising a motor bellows and a detachable' channel block, and detachable pipes communicating with the channels of adjacent channel blocks.

3. In a pneumatic motor, an assemblage of separable units, eachcomprising a'motor bellows and a channel block, detachable air pipes between the channels of adjacent blocks, and connecting bars attachedto said channel blocks.

` 4. In a pneumatic motor, a Valve seat, a

Valve slidable thereon, and metal waysV for -a straight central section, with two right angled bends parallel with the plane of the Valve seat and two right angled bends at right angles to the plane of the Valve seat and having its ends held in the valve seat.

VCTOR J. JOHNSON. Witnesses:

PENELOPE COMBERBACH, NELLIE WHALEN. 

